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Anyone using one of the DSI units. I an looking at buying the Elite - 5 DSI color for the bow. As I understand it the unit has the DSi but not the old sonar. When asking about it the common response was if you have DSI why do you want the sonar. What do you guys know or think. Also I just put the HDS7 on the bow had several people telling me I need the HDS unit on bow but I kind of like the DSI feature I think.